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Citation: Xu Xian-Ping, Xie You-Chang, Zhao Bi-Ying, Tang You-Qi. Study on Dispersion Speed and Mechanism of MoO₃ and CuCl on the Surface of γ-Al₂O₃[J]. Acta Physico-Chimica Sinica, ;1990, 6(03): 263-268. doi: 10.3866/PKU.WHXB19900303 shu

Study on Dispersion Speed and Mechanism of MoO₃ and CuCl on the Surface of γ-Al₂O₃

1.
Institute of Physical Chemistry, Peking University

Received Date: 4 January 1990
Available Online: 15 June 1990

It has been shown that many oxides and salts can disperse spontaneously onto supports with large surface area~[1]. A typical example studied widely is the dispersion of MoO_3 on γ-Al_2O_3. However, the research work about the dispersion mechanism and kinetics is quite few.
Knozinger etc.~[2] suggested that the dispersion of MoO_3 onto the surface of γ-Al_2O_3 may occur through a "gas phase transport" mechanism mainly by assuming an intermediate MoO_2(OH)_2(g), and the presence of water is necessary. Their conclusion was based on a fact that after heating a mixture of MoO_3 and γ-Al_2O_3 in the presence of H_2O vapour at 450 ℃, the characteristic peak at 950 cm~(-1) of monolayer dispersed MoO_3 in Laser Raman Spectrum (in situ) appears, but after heating the mixture in dry oxygen, it can not be observed...
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Study on Dispersion Speed and Mechanism of MoO3 and CuCl on the Surface of γ-Al2O3

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Study on Dispersion Speed and Mechanism of MoO₃ and CuCl on the Surface of γ-Al₂O₃